Merge tag 'csky-for-linus-6.2-rc1' of https://github.com/c-sky/csky-linux

Pull arch/csky updates from Guo Ren:

 - Revert rseq support - it wasn't ready

 - Add current_stack_pointer support

 - Typo fixup

* tag 'csky-for-linus-6.2-rc1' of https://github.com/c-sky/csky-linux:
  Revert "csky: Add support for restartable sequence"
  Revert "csky: Fixup CONFIG_DEBUG_RSEQ"
  csky: Kconfig: Fix spelling mistake "Meory" -> "Memory"
  csky: add arch support current_stack_pointer

arch/csky/Kconfig

@@ -9,6 +9,7 @@ config CSKY
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
+	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_INLINE_READ_LOCK if !PREEMPTION
 	select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
 	select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
@@ -93,7 +94,6 @@ config CSKY
 	select HAVE_PERF_USER_STACK_DUMP
 	select HAVE_DMA_CONTIGUOUS
 	select HAVE_REGS_AND_STACK_ACCESS_API
-	select HAVE_RSEQ
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
 	select MAY_HAVE_SPARSE_IRQ
@@ -269,7 +269,7 @@ menuconfig HAVE_TCM
 	bool "Tightly-Coupled/Sram Memory"
 	depends on !COMPILE_TEST
 	help
-	  The implementation are not only used by TCM (Tightly-Coupled Meory)
+	  The implementation are not only used by TCM (Tightly-Coupled Memory)
 	  but also used by sram on SOC bus. It follow existed linux tcm
 	  software interface, so that old tcm application codes could be
 	  re-used directly.

arch/csky/include/asm/processor.h

@@ -84,4 +84,6 @@ unsigned long __get_wchan(struct task_struct *p);
 
 #define cpu_relax() barrier()
 
+register unsigned long current_stack_pointer __asm__("sp");
+
 #endif /* __ASM_CSKY_PROCESSOR_H */

arch/csky/kernel/entry.S

@@ -54,7 +54,7 @@ ENTRY(csky_systemcall)
 
 	lrw     r9, __NR_syscalls
 	cmphs   syscallid, r9		/* Check nr of syscall */
-	bt      1f
+	bt      ret_from_exception
 
 	lrw     r9, sys_call_table
 	ixw     r9, syscallid
@@ -80,11 +80,6 @@ ENTRY(csky_systemcall)
 	jsr     syscallid
 #endif
 	stw     a0, (sp, LSAVE_A0)      /* Save return value */
-1:
-#ifdef CONFIG_DEBUG_RSEQ
-	mov	a0, sp
-	jbsr	rseq_syscall
-#endif
 	jmpi    ret_from_exception
 
 csky_syscall_trace:
@@ -113,10 +108,6 @@ csky_syscall_trace:
 	stw	a0, (sp, LSAVE_A0)	/* Save return value */
 
 1:
-#ifdef CONFIG_DEBUG_RSEQ
-	mov	a0, sp
-	jbsr	rseq_syscall
-#endif
 	mov     a0, sp                  /* right now, sp --> pt_regs */
 	jbsr    syscall_trace_exit
 	br	ret_from_exception

arch/csky/kernel/signal.c

@@ -179,8 +179,6 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
 	sigset_t *oldset = sigmask_to_save();
 	int ret;
 
-	rseq_signal_deliver(ksig, regs);
-
 	/* Are we from a system call? */
 	if (in_syscall(regs)) {
 		/* Avoid additional syscall restarting via ret_from_exception */

arch/csky/kernel/stacktrace.c

@@ -23,10 +23,9 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
 		sp = user_stack_pointer(regs);
 		pc = instruction_pointer(regs);
 	} else if (task == NULL || task == current) {
-		const register unsigned long current_sp __asm__ ("sp");
 		const register unsigned long current_fp __asm__ ("r8");
 		fp = current_fp;
-		sp = current_sp;
+		sp = current_stack_pointer;
 		pc = (unsigned long)walk_stackframe;
 	} else {
 		/* task blocked in __switch_to */
@@ -68,8 +67,7 @@ static void notrace walk_stackframe(struct task_struct *task,
 		sp = user_stack_pointer(regs);
 		pc = instruction_pointer(regs);
 	} else if (task == NULL || task == current) {
-		const register unsigned long current_sp __asm__ ("sp");
-		sp = current_sp;
+		sp = current_stack_pointer;
 		pc = (unsigned long)walk_stackframe;
 	} else {
 		/* task blocked in __switch_to */